In NixOS, is there any way to create a package that has pandoc, pandoc-citeproc, and pandoc-crossref?

I'm very new to NixOS. I use Pandoc a lot, often with pandoc-citeproc, but I can't find a NixOS package for pandoc-citeproc. I see that there's a Haskell library for pandoc-citeproc in HaskellPackages. How can I combine a Pandoc binary which is installed system-wide with a Haskell library?